Not sure how this is happening, but someone is somehow taking turns for me in games I no longer have access to.

I've been playing 4 games with my friends. Two of the 4 recently vanished from my resumable games.

However, someone (a bot, I assume) is taking my turns.

I didn't run out of time: my friends note that I have 1 day and 18 hours in one of them, 1 day and 19 hours in the other.

Is this a known bug?

Not that I'm aware of. You can report the problem using this form: http://www.daysofwonder.com/en/contact/digital-t2r/ Give us as many details as you can (screenshots, device details for you and your friends, which map you were playing, etc) so that we can recreate the problem and then the team will be able to see what's going on and get it fixed. Thanks!